Interesting idea, especially if you would have use for the $ if TSLA broke above $1,200 by J'22. My guess is you're hoping it doesn't so you don't leave $ on the table.
So you're thinking:
1. Pocket cash 12/18 by selling covered calls
2. If after SP500 inclusion there's a dip, buy calls to close the original sold ones at a lower $, keep the difference, maybe buy more shares
3. If there's not a dip, hope TSLA rises but doesn't hit $1,200 by J'22
4. If it does hit $1,200, take the money on assignment, don't regret what might have been (say TSLA at $1,500 J'22).
#4 is the real worry, but it's a first world worry.